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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities NOTE : If the fill cap is not included in the the spill bucket . The vacuum level is monitored for spill bucket test and/or the cap is not tight , it a 1 - minute period . could be the source of potential fuel contami- 6 . 3 . 3 Test Equipment . Test equipment shall nation from water intrusion . include : • vacuum test apparatus (The test apparatus may NOTE : Before permanently plugging , ensure be available from the spill bucket manufacturer. that local regulations allow the drain valve to It includes an air pressure regulator, a vacuum be permanently plugged . source, a vacuum gauge with a minimum 0-50 inch water column range and a control valve . 6 . 2 . 5 Test Procedure . The control valve is used to adjust the vacuum 1 . Add water to the spill bucket to a level within level . ) ; 1 . 5 inches of the top of the spill bucket. Allow test cover (The cover is equipped with a test fit- the water to settle for 5 minutes before the initial ting . ) ; water level measurement is taken . • plumber ' s plug (appropriate size, if used) ; 2 . Place the measuring stick vertically at the lowest point in the spill bucket and extending above the stopwatch or other time-measurement device water level to allow for an accurate measure- capable of measuring a 1 - second increment ; meat to be taken . The location Of the measurincr Basketing material (The purpose of the gas- stick must remain the same for each water level keting material is to provide an air-tight seal measurement. Document the initial water level between the test cover and the spill bucket . ) . measurement as measured from the bottom of the spill bucket . Alternative measurement meth- 0 50" water Column ods may be used provided that measurement to Vacuum Vacuum Gauge 1 / 16 (0 . 063 ) inch can be made . Source 3 . Take all precautions to prevent the water level from being disturbed during the duration of the Control test . Valve 4 . After 1 hour, document the ending water level measurement. 5 . Upon completion of the test, remove and dis- pose of the water according to Section 6 . 7 , and dry the inside of the spill bucket before returning Plumber's Plug in it to service . Tank Riser Pipe 6 . 2 . 6 Pass/Fail Criteria . If the water level has dropped less than 1 /8 (0 . 125 ) inch, the spill bucket passes the integrity test. If the water level has dropped 1 /8 (0 . 125 ) inch or greater, the spill bucket fails the integrity test . 6 . 3 Spill Bucket Integrity Testing — Vacuum Test FIGURE 6-2 . The cover must make a tight seal with the Method . spill bucket to prevent leakage when the vacuum is 6 . 3 . 1 Purpose . This method is used to test the pulled during the test. integrity of single-walled spill buckets or the pri- mary containment of secondarily contained spill WARNING • Use only an air-operated vac- buckets . uum source or a vacuum pump pow- 6 . 3 . 2 Description of Test . Using a specially ered by an explosion-proof motor. Vacuum equipped test cover, a partial vacuum is applied to pumps with electric motors that are not pei . org